Fourths to frederick skrainka



(No Model.) 2 sheets-sheen 1.

LA MOTTE C. ATWOOD.

ELEGTRIG ARG' LAMP. No. 404,245. Patented May 28, 1889.

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Il lll (No Model.) 2 Sheets .Sheet 2,. LA MOTTE C. ATWOOD.

ELECTRIC ARC LAMP.

No. 404,245. Patented Mey 28, 1889.

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UNITED STATES PATENT OFFICE.

LA MOTTE O. ATIVOOD, OF ST. LOUIS, MISSOURI, ASSIGNOR OF TIIREE- F(')IIRTIIS T() FREDERICK SKRAINKA, LOUIS SIIRAINKA, AND ED- \\IARD '13. ROTH, ALL OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 404,245, dated May 28, 1889.

Application filed January Z3, 1889. Serial No. 297,295. (No model.)

To [LZ whom it may concern:

Be it known that I, LA MOTTE C. ATWOOD, of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Electric-Arc Lamps, of which the following' is a full, clear, and exact dcscription, reference being' had to the accompanying drawings, forming part of this specilicatien, and in which Figure I is an elevation of my improved lamp. Fig. II is a transverse horizontal section taken on line II II, Fig. I. Fig. III is a similar view taken on line III III, Fig. I. Fig. IV is a side view.

My invention relates to certain improvements in electric-are lamps which are Well adapted for use as locomotive head-lights, but which maybe used for other purposes; and my invention consists in 'features of novelty, hereinafter fully described, and pointed ont in the claims.

Referring to the drawings, l represents a suitable base, and 2 a vertical frame.

3 represents an upper and l a lower screw supported by the frame 2. These screws are joined at 5, as shown in Fig. IV.

G represents an arm having threaded connection with the screw 8, and 7 an arm having threaded connection with the screw e. The arm 7 is connected bya cross-head, 7%, to the frame 2, and to it the lower carbon, S, is secured by a suitable clamp, Q. The upper arm, 6, has a socket or hole, through which passes Jthe stem l0 of a clamp, ll, that holds the upper carbon, 11%.

l2 represents a .lever having slot-and-pin connection 13 with. the stem IO, and which is l'ulcrumed or pivoted at 14 to a projection, l5, on the arm t5. Beyond the pivot Il the lever is bifurcated, as shown in Fig. II, to straddle the screw To its outer ends is secured an armature, IG, located over a magnet, I7, (single or double,) supported on a cross-head, I8, formed upon or secured to the arm f3, and Which has slotted connection 1811- With the traine (See Fig. II.) It will thus he seen that as the screw is turned the cross-head and arm (with the parts connected to them) will be moved up or down, according to the direction in which the screw turned.

IO represents the Wire from the dynamo, (not sho\vu,) through which the current passes to the upper carbon. The Wire l.) connects direct with the magnet I7, and a short wire, 20, conveys the current from the magnet to the carbon, the inner end of the wire being connected, preferably, to the arm d at 2], and the arm, being composed of a conductive material, conveys the current to the carbon through the stem and clamp I0 11. The vtirst action of the current to pull down on armature 16, (which, until the current enters the magnet, supported by a spring, 22, secured to the arm G and bearing upward on the outer end of the lever 12,) thus lifting the upper carbon and producing the arc. The current passes from the lower carbon through'a wire, 23, to the fixed end 241 of a plate, 25. (See arronv A, Figs. III and IV From the plate the wire passes to a magnet, 2G, (which may be single or double,) thence back to a plate, 27, beneath the free end of the plate 25, 'from thence back past the magnet 26 to the nxed end 2S of a plate, 20, and from here the wire passes to a motor, 30, of any suitable construction. From the motor the wire passes back to a plate, 3l, beneath the :free end of the plate 29, and from here to a binding-post, Si?, and thence to the dynamo.

The plate 25 is connected to the free end of a lever, 33, to which an armature, 3l, is secured. The lever is pivoted to a post, 35, and back of the post a threaded rod. 3G, provided ivith a thumb-nut, 537, passes. The rod is connected by a spring, 38, to the base or bed-plate 1. The spring 38 acts to keep the armature SJC normally out of contact with a magnet, 89, (single or double,) located beneath the armature, and also to keep the -free end of the plate 25 out of contact with the plate f3".

The plate 29 is connected to the tree end of a lever, l0, to which is secured an armature, hlocated over the magnet 2G. The lever 40 is pivoted to a post, l2, and back of the back a threaded rod, 43, provided with a thumb nut, la, passes through it. The rod is con nected by a spring, et, to the base l, which acts to keep the armature .normally out of contact with the magnet 2G, and also to keep IOO the free end of -the plate 29 out of contact with the plate 3l.

46 represents av friction-wheel on the shaft 47 of the motor 30. Over this wheel passes a strap-brake, 48, one end of which is made fast at 50 to a post,49,and the other end of which is made fast at 51 to one arm of a bell-crank lever, 52, pivoted at 53 to the post 49, and the other end of which is connected at 54 to the rod 55 that joins the plate 29 to the lever 40. It will thus be seen that the brake will be applied to the wheel normally, or while the armature 41 is in contact with the magnet 26.

The motor maybe of any oidinaiyconstruction, as stated, and when the brake is applied to the wheel, as described, the motor is inactive, or does not run. On the other end of the shaft from the friction-wheel is a worm, 55, meshing into a wheel, 5G, on the lower end of the screw 4. (See Figs. I and III.) This wheel 56 has a number of perforations, 57, in which fit pins 58 on links 59, secured to arms GO made fast to the screw 4. The wheel, While loose on the screw itself, is thus made to turn the screw by the arms, links, and pins. The pins may be removed from the perforations by lifting upon the outer ends of the links and moved overinto an annular groove,r 61, when it is desired to turn the screws by hand. Thus the feed of the carbons is made automatic. Vhen the arms 6 7 have approached as near each other as is desired, or when the carbons have been consumed, the arms 6 7 are opened out again by disconnecting the pins 58 from the holes 57 of the wheel 56 and placing them in the groove 6l. Then by taking hold of the thumb-screw 100 on the other end of the screw 3 the screws can be turned in the opposite direction to that in which they were automatically moved and the arms made to move from each other to their respective upper and lower positions. Then by placing the pins 58 back in the holes 57 the feed is again made automatic.

The operation is as follows: The electric current, as stated, passing through the wire 19 to the magnets 17, pulls down on the armature 16 on the outer end of the lever 12 and lifts the upper carbon, thus forming the arc. The current passes through the carbons, out through the wire 23, first to the plate 25, then to the magnet 26, then to the plate 27, thence to the plate 28, thence to the motor, thence to the plate 31, and thence to the dynamo by way of the posts 3 2. As soon as the carbons burn away enough to produce a sufficient resistance to the passage of the current through the carbons a portion of the current will pass from the wire 19 through a shunt-wire, 101, to the magnet 39, and through a wire, 102, to the wire 23. The action of this is to pull the armature 34 down onto the magnet 39, and the free end of the plate 25 down onto the plate 27, thus short-circuiting the magnet 26 and releasing the armature 4l and lifting the free end of the plate 29 out of contact with the plate 3l, (so that the entire current will pass to the motor,) and also at the same time releasing the brake of the motor. rIhe motor so starts and feeds the carbons through means of their described connection with the motor. As soon as the carbons have approached each other to normal position the current will cease to pass through the shunt, releasing armature 34, and breaking contact between plates 25 and 27 and compelling the entire current to pass through magnet 2G, attracting armature 41 and closing contact between plates 29 and 31, and cutting out the current from the motor and applying the brake, and thus the operation goes on continuously and automatically.

I claim as my invention- 1. In an electric-arc lamp, the combination of the feed-screws, arms connected to the screws and provided with clamps to hold the carbons, a stem on the clamp of the upper carbon passing through a perforation in the upper arm, a pivoted lever connected to the stem, an armature secured to the lever, and a magnet supported by the upper arln, substantially as and for the purpose set forth.

2. Inl an electric-arc lamp, the combination of the base, a vertical frame, cross-heads movably secured to the frame, and upper and lower arms formed upon the cross-heads and provided with clamps for holding the carbons, a stem on the clamp of the' upper carbon passing through a perforation in the upper arm, a lever having slot-and-pin connection with the stem, an armature on the lever, and a magnet carried by the upper arm, substantially as and for the purpose set forth.

3. In an electric=arc lamp, the combination of the carbon-screws, a motor for automatically feeding the carbons, a magnet, an armature secured over the magnet by means of a pivoted lever, a connection between the lever and a brake of the motor, and plates operated by said armature, and wires adapted to automatically place the motor into and out of operation7 substantially as and for the purpose set forth.

4. In an electric-arc lamp, the combination, with the carbons, of magnets 26 and 39, armatures 34 and 41, and contact-plates operated by said armature and wires, all arranged and operating to automatically regulate the distance between said carbons, substantially as and for the purpose set forth.

5. In an electric-arc lamp, the combination of the carbon-feed screws, a motor provided with a brake-wheel, a strap passing around the wheel and connected by one end to a bellcrank lever, a magnet, apivote'd lever having an armature located over the magnet, and a connection between the said levers, substantially as and for the purpose set forth.

6. In an electric-arc lamp, the combination of the screws for automatically feeding the carbons, a motor, a worm on the shaft of the motor, a wheel on one of the screws and en- IOO IIO

secured to the ar1ns,and pins 5S on the links 1o and tting in holes 57 made in the Wheel, said Wheel having a groove, 6l, substantially as and for the purpose set forth.

LA MOTTE (l. ATVOOD.

In presence 0- GEo. H. KNIGHT, EDW. S. KNIGHT. 

